added package box
== Install package.el on Emacs 23 ==
<tt>package.el</tt> is bundled with Emacs 24, but it’s not bound to Emacs 23. Before it became part of Emacs it was an external package, known as ELPA (I guess that stood for Emacs Lisp Package Manager or something similar). So even if you’re an Emacs 23 user you can copy the latest version of <tt>package.el</tt> from [http://repo.or.cz/w/emacs.git/blob_plain/1a0a666f941c99882093d7bd08ced15033bc3f0c:/lisp/emacs-lisp/package.el here] and enjoy it.